Neovibe prebuild questions

[axg20202]

Strange...they were available from the RS website when I looked....no good to me because I'm in the UK, but it might be worth checking for US people...

[alderbody]

No. 2. I used a 220k trimpot instead of R35-36 and put the wiper on one end and the other two lugs on the other end.

I used a 16 mm Alpha pot in the mixer because the trimpot sounded flat and un-musical. (it's not an extrenal control)

If you use the box mentioned in the project file, there's plenty of room for such tricks.

here's mine:



And here you can find some clips:

http://www.diystompboxes.com/userfiles/index.php?&direction=0&order=&directory=public_downloads

[marlin]

I used a 16 mm Alpha pot in the mixer because the trimpot sounded flat and un-musical. (it's not an extrenal control)

If you use the box mentioned in the project file, there's plenty of room for such tricks.

here's mine:

That's a really nice looking pedal! I changed my enclosure and transformer this week, maybe i can show some pics tonight. I didn't hear any differeces between the 250k alps pot i used first and the trimpot, i need to check that....
How did you wire the chorus/vibrato led? I only have a on/off led that is pulsing at speed rate.

[alderbody]

That's a really nice looking pedal! I changed my enclosure and transformer this week, maybe i can show some pics tonight. I didn't hear any differeces between the 250k alps pot i used first and the trimpot, i need to check that....
How did you wire the chorus/vibrato led? I only have a on/off led that is pulsing at speed rate.

Thanks!

I'm not using an internal transformer. I have a 24VDC supply and i feed it directly in the vibe.

About the trimpots, maybe it was just my trims that were crappy. But i surely got a far better sound with the alpha pot.

I used a 3PDT switch instead of the SPST that is the standard for the Ch/Vib. The extra lugs carry the Led connections.
Mine don't flash with the LFO speed, but they light only when the Bypass switch is on (effect on).

EDIT: I will re-shoot some pedal pics because the ones i have are mostly bad and blurry...   

[3/4 North]

Also which lugs do J & K go to on this DC jack? http://www.smallbearelec.com/Detail.bok?no=93 I'm just a little confused because of the "DO NOT GROUND EITHER WIRE!!! DO NOT LET POWER JACK TOUCH CHASIS!!!" warnings from the PDF file.

I'm using this transformer from Mouser

      1  418-TR1524-12               1     13.900           13.90
         Cincon Wall Mount AC
         24VDC 15W 2.5mm DC

It works and the effect hasn't started smoking yet, although since I haven't boxed the effect yet I don't know if it buzzes.

this jack:



"The Board - and Battery -" which looks like the center to me:  K (+)
"To Board +":  J (-)


btw this was the box I used from Mouser:

      1    563-CN-5711                   1       26.400           26.40
         Bud NEMA 4X Die Cast
         8.75 X 5.74 X 2.25 

[marlin]

Im using an old used 16V AC (or was it 17?) external transformer, no hum from that. When trying more that 20V AC i got hum but maybe the transformer was bad i don't know. I tried to put the transformer in the same enclosure but then it got really hummy, i tried with shielding plates etc but never got it to work. If someone know of a transformer setup that would work in same enclosure it would be great if they could share.. 

[R.G.]

Look at Digi-key's toroidal transformers. Toroidals are about as un-hummy as you can make an AC line transformer.

[momo]

So here is my enclosure for my Univibe build, now Im reading about putting the transformer inside the case in the space you see to the left of the pc board paper cutout, is this too close to the components? Im I asking for trouble?, I would love to put the transfo there, but if it means trouble shooting and finding a way to isolate for buzzes, then Ill just cut the workload and put a wall wart until I get to build a proper power supply for all my effects.
Thanks for the replies!

[3/4 North]

That pdf cutout was smaller than the board I got from GGG.

[momo]

That pdf cutout was smaller than the board I got from GGG.

AHHHGGRRR!!!, thanks for the heads up... I know that there are a couple of pdf versions for the cutout, and this is the supposed right size template. I did get the GGG board and have not recieved it yet, so I will have to see. Are you talking about the pdf that has the supposed "actual size". Is it really bigger,or you think I could dremel the sides a bit to make it fit?

[3/4 North]

Mine is at home right now, but it wasn't just extra board, the scale was different. Thankfully bigger cause the traces are tight enough.

You could always dremel a notch on the inside wall too, helps hold the board in place.

[R.G.]

Go to digikey.com. Check out the Amveco low power toroidal transformers. In particular, look at the TE62011 and TE62021. the former supplies 178ma of 18Vac, the latter supplies 278ma of 18Vac. The bigger one is $19, but it is only 47mm diameters by 18mm high - that's 1.85" diameter by 3/4" tall for us non-metrifiers. I think it fits neatly into that cavity to the left of your board in the picture.

[marlin]

Thanks for the tip R.G. I cannot find any supplier of those near me but i found a brand called "Noratel". Think i'm going to try one of those if i cannot find the ones you mentioned. I think a torodial would fit perfect.

Here's a pic of my new crazy enclosure and the shield i made (nc-milled), gonna replace the one that is mounted on the board (a bit big) 
Gonna remove the "extra" material that sticks out in front of the box and add some labeling...

[cheech]

This is to any of you that have done the depth adjustments with the 200k pot.  Here is a sound clip of me playing bridge of sighs.  Should I do the depth adjustments?  This is set on maximum depth atm.  The highs seem to cut right through like butter.

10mb!  Sorry its before work and I couldnt find a program to compress it.
"www.sublimeparadise.com/me trower.wav"

William

[momo]

Marlin, that is some awsome lightbulb box you got there!, R.G thanks for the toroidal tip, that will fit perfectly!, I might have to dremel the sidewall for the board as mentioned and that will only increase my satifaction when I fire up the thing!...

[Fuzzy-Train]

No. 2. I used a 220k trimpot instead of R35-36 and put the wiper on one end and the other two lugs on the other end.

I used a 16 mm Alpha pot in the mixer because the trimpot sounded flat and un-musical. (it's not an extrenal control)

If you use the box mentioned in the project file, there's plenty of room for such tricks.

here's mine:



And here you can find some clips:

http://www.diystompboxes.com/userfiles/index.php?&direction=0&order=&directory=public_downloads

Damn nice build! Is that a BB with the 2' walls?
Just wondering.... did you use a printer for the UNI-VIBE logo decal? If so, could you PM me the image... I'm planning on using that logo but I just can't find one.

Would it be possible/has anyone tried to add an external exp pedal to control the rate like the original? Maybe something that bypasses the original rate knob, or to add another rate control so you can have a dual rate option.

[Fuzzy-Train]

I e-mailed Steve at smallbear, and he actually sells the bulbs now. It's weird though, i've been through his site with a fine toothed comb and never found the bulbs..

he has 2 versions BTW

A screw in model.

http://www.smallbearelec.com/Detail.bok?no=645

and one with just wires.

http://www.smallbearelec.com/Detail.bok?no=646

[marlin]

I e-mailed Steve at smallbear, and he actually sells the bulbs now. It's weird though, i've been through his site with a fine toothed comb and never found the bulbs..

he has 2 versions BTW

A screw in model.

http://www.smallbearelec.com/Detail.bok?no=645

and one with just wires.

http://www.smallbearelec.com/Detail.bok?no=646

Nice, is there a socket for the screw in? I can't find any...

[Fuzzy-Train]

Yeah, neither can I... but I couldn't find the bulbs either, so they could be hiding somewhere in there.

I think I'll just use the one with the wires though... make it easier so i don't have to hunt down a socket.

[SteveB]

....
2) For speed it was suggested changing R49 from 4.7k to 47k (someone also suggested 10k) and R48 to 120 ohm.  There's no reason to change R48 since trimmer 1 controls it.  I put a 50k trimmer in for R49 but switched it out for a 47k resistor.

Changing R49 changes the strength of the swing. To me, at 4.7k, its a real heavy, almost "on-off", & 47k is almost too subtle, so I am happy with 10k. It's all a matter of personal taste.

The fast speed is controlled by R42 & R43. the lower the values, the faster the "fast" speed will be.

Here is the AC adapter I've used for years with mine.


http://www.peavey.com/products/browse.cfm/action/detail/cat/120/item/8575/number/00710160/16%2E5VoltACPowerSupply.cfm

Steve